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NCERT Class XII Chemistry
Chapter - Chemical Kinetics
Questions with Solutions

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Question : 1
Total: 39
From the rate expression for the following reactions, determine their order of reaction and the dimensions of the rate constants.
(i) ‌3NO(g)→N2O(g); Rate =k[NO]2
(ii) ‌ H2O2(aq)+3I(aq)−+2H+→ 2H2 O(1)+I−3; Rate =k [ H2O2][ I−]
(iii) ‌CH3 CHO(g)→CH4(g)+CO(g); Rate = k[ CH3CHO ]3∕2
(iv) C2H5CI(g)→C2H4(g)+ HCl(g); Rate =k [C2H5Cl ]
Solution:  
(i) Order =2, Dimensions of k=
Rate
[NO]2

=
mol L−1s−1
( mol L−1 )2
= L mol−1 s−1
(ii) Order =2, Dimensions of k= L mol−1s−1
(iii) Order =
3
2
,
Dimensions of k=
Rate
[CH3 CHO ]3∕2

=
mol L−1 s−1
( mol L−1 )3∕2
= L1∕2 mol−1∕2s−1
(iv) Order =1, Dimensions of k=
Rate
[ C2H5Cl ]

=
mol L−1 s−1
mol L−1
=s−1
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